Recreational Vehicle (RV) Technician Practice Test

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Which type of over-current protection is generally not utilized in 120v circuits?

Slow blow fuse
Circuit breaker
Fuse link
Fast acting fuse

The correct answer is: Slow blow fuse

Over-current protection is essential for ensuring safety in electrical circuits, including those found in recreational vehicles. The type of over-current protection generally not utilized in 120v circuits is a slow blow fuse. Slow blow fuses are designed to withstand short surges of current that can occur when devices are initially powered on, making them suitable for applications like motors or appliances with higher inrush current. However, in 120v circuits, which often involve lighter loads and do not typically deal with the kinds of current surges seen in motors, fast acting fuses or circuit breakers are preferred. These types of protection devices react quickly to over-currents, ensuring that in the event of a fault, power is cut off promptly, reducing the risk of overheating and fire. Understanding the context in which each type of fuse is used helps clarify why a slow blow fuse is not the ideal choice in 120v applications.